fix: add reboot endpoint and test documentation

Co-authored-by: Cursor <cursoragent@cursor.com>

src/web_server.cpp

@@ -135,6 +135,13 @@ void AppWebServer::setupAPIRoutes() {
             delay(100);
             _power->enterDeepSleep();
         });
+
+    _server.on("/api/action/reboot", HTTP_POST,
+        [](AsyncWebServerRequest* req) {
+            req->send(200, "application/json", "{\"ok\":true,\"msg\":\"Rebooting...\"}");
+            delay(500);
+            ESP.restart();
+        });
 }
 
 void AppWebServer::setupStaticFiles() {

test/README.md

@@ -0,0 +1,44 @@
+# Testing
+
+## Native Tests (host machine)
+
+Run algorithm tests that don't require hardware:
+
+```bash
+pio test -e native
+```
+
+Tests:
+
+- `test_photo_queue.cpp` — queue cycling, favorites weighting
+- `test_image_pipeline.cpp` — nearest color, dithering correctness
+
+## On-Device Testing
+
+Flash and monitor:
+
+```bash
+pio run -e m5stack-papercolor -t upload && pio device monitor
+```
+
+### Verification Checklist
+
+- [ ] Device boots and prints version to serial
+- [ ] AP mode activates on first boot
+- [ ] Captive portal serves setup page at 192.168.4.1
+- [ ] WiFi credentials save and device reboots to station mode
+- [ ] mDNS resolves at papercolor.local
+- [ ] Web UI dashboard shows battery/WiFi/uptime
+- [ ] Albums page lists Immich albums
+- [ ] Album selection persists across reboots
+- [ ] Photos download and display correctly
+- [ ] Portrait photos pair side-by-side
+- [ ] Slideshow advances at configured interval
+- [ ] BTN_UP: next photo (LED flashes white)
+- [ ] BTN_TOP: random photo (LED flashes white)
+- [ ] BTN_DOWN: pause/play toggle
+- [ ] BTN_TOP+BTN_DOWN 3s: deep sleep
+- [ ] BTN_UP 5s: factory reset
+- [ ] Battery LED: orange at 25%, red at 10%
+- [ ] OTA upload succeeds via web UI
+- [ ] Device recovers from WiFi disconnect (reconnect on next cycle)